The Kettlebell Overhead Reverse Lunge will really challenge your shoulder stability as well as your core strength.
The exercise is performed exactly the same as a regular Reverse Lunge except the Kettlebell is held with a locked arm overhead. It is very important to lock out the arm or the arm will fatigue very quickly. If you cannot lock out the arm then you may want to work on some shoulder and thoracic mobility work as well as the Kettlebell Arm Bar.
Ensure that your grip is maintained in a strong position as the grip talks directly to the shoulder and will ensure everything is kept tight.
Hold the Kettlebell in the same arm as the side of the leg that will be stepping backwards.
This exercise is advanced so ensure that you are able to hold a kettlebell overhead for a good 30 seconds but preferably a minute before attempting it.